CN108506257B - Three-way jet pipe servo valve jet axis track debugging device and method - Google Patents
Three-way jet pipe servo valve jet axis track debugging device and method Download PDFInfo
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- 238000006073 displacement reaction Methods 0.000 claims description 3
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
- F15B19/002—Calibrating
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Abstract
The invention relates to a three-way jet pipe servo valve jet axis track debugging device and a method. Compared with the prior art, the method has the advantages of simple detection method, high accuracy, high efficiency, high reliability and the like.
Description
Technical Field
The invention relates to the technical field of jet pipe servo valves, in particular to a device and a method for debugging the jet axis track of a three-way jet pipe servo valve.
Background
Jet servo valves were first invented by the company Askania, germany during world war ii. The jet pipe valve has been widely used in hydraulic systems of civil and military aerospace equipment due to the fault safety function of the jet pipe valve. In 1957, R.Atchley invented a two-stage jet pipe servo valve based on the principle of Askania (refer to patent document: R.D.Atchley.Servo-mechanism: US2884907A [ P ]. 1957-8-30). Gerald C.Zoller (refer to patent document: Gerald C.Zoller.variable gain jet sheet serving vacuum: US3589238A [ P ].1969-2-24) installs a movable circular jet guide cavity between the fixed nozzle and receiving hole in the front stage of the jet pipe servo valve, and the aim of adjusting the recovery pressure is achieved by changing the relative positions of the guide cavity, the nozzle and the receiving hole. In 1971, Clyde E.Cobb (refer to patent documents: Clyde E Cobb, Charles Ejones. Adjustable receiver port constraint for jet pipe servivale: US3584638A [ P ].1971-6-15) and the like invented a jet pipe servo valve with adjustable receiving holes, wherein two receiving holes of a front stage are directly arranged on a main valve core, and the positions of the two receiving holes relative to a nozzle can be adjusted through radial adjustment of the main valve core, so that the effect of adjusting the receiving hole recovery pressure is achieved. Richard D.Bartholomew (refer to patent document: Richard D.Bartholomew.optical feedback loop system for a hydraulic detent: US4660589A [ P ].1986-3-3) adopted an electromagnetic positioner instead of the traditional hydraulic and electric positioners, and the feedback mode is more accurate than mechanical feedback. In various methods for adjusting the receiving hole to restore the pressure, the core is to adjust the relative position of the nozzle and the receiving hole, so that the motion track of the nozzle driven by a torque motor is changed, the flow rate of the jet flow of the nozzle flowing into the receiving hole is changed, and the purpose of adjusting the restoring pressure is achieved. Because the working environment of the servo valve is complex, the servo valve is easily influenced by various factors in the working process, so that the position of a nozzle is deviated, the change of the jet axis track occurs, and the influence caused by the change is often unfavorable. Therefore, it is necessary to provide a method for adjusting the trajectory of the jet axis as desired.
Because the three-way jet pipe servo valve works in a closed space, the jet axis track of the three-way jet pipe servo valve cannot be directly detected. At present, most methods for adjusting the jet axis trajectory by people are based on experience, intuition, hand feeling and the like, and the methods lack of speciality and are not intuitive.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a device and a method for debugging the jet axis track of a three-way jet pipe servo valve.
The purpose of the invention can be realized by the following technical scheme:
the device comprises a valve body, a jet receiver arranged on a jet area on the valve body, a jet nozzle which is arranged opposite to the jet area and controls displacement through a torque motor, and a pressure sensor connected with the jet nozzle through a detection hole.
Preferably, the jet receiver be inverted circular truncated cone shape, the lower part is fixed in the efflux region, upper portion and jet nozzle set up relatively, be equipped with efflux receiving hole, last pressure measurement hole and holding down force measurement hole on its up end respectively, the efflux receiving hole with set up the receiving slot hole intercommunication in the valve body, go up pressure measurement hole and holding down force measurement hole and be connected with pressure difference sensor through right side detection slot hole and left side detection slot hole respectively.
Preferably, the jet flow receiving hole is a straight hole perpendicular to the upper end face of the jet flow receiver, the upper pressure detection hole and the lower pressure detection hole are inclined holes and are symmetrically arranged in a splayed shape, and in order to prevent the interference between the pressure detection holes and the jet flow receiving hole, the included angle between the axis of the jet flow receiving hole and the axes of the upper pressure detection hole and the lower pressure detection hole is 15-35 degrees, preferably 30 degrees.
Preferably, the perpendicular bisector of the line connecting the circle centers of the upper pressure detection hole and the lower pressure detection hole passes through the circle center of the jet flow receiving hole.
Preferably, the radius R' of the upper and lower pressure detecting holes is half of the radius R of the jet receiving hole.
Preferably, the distance between the centers of the upper pressure detecting hole and the lower pressure detecting hole is R' +0.02 mm.
A debugging method comprising the steps of:
1) connecting pressure difference sensors on two sides of the valve body, placing the jet nozzle at an initial position, starting a driving torque motor, and enabling the jet nozzle to finish a moving process from the initial position to a final point under the action of the torque motor;
2) in the moving process of the jet nozzle, acquiring the pressure difference value of the pressure detection holes at two sides, and judging whether the jet axis track meets the requirement or not according to the pressure difference;
3) when the jet flow axis track meets the requirement, namely the jet flow axis track is overlapped with or parallel to the x axis and has a set expected value at a distance, the pressure difference value sensor is disassembled, the detection long hole is sealed by using a sealing screw, and the debugging of the jet flow axis track is completed;
4) and when the jet axis trajectory does not meet the requirement, readjusting the installation position of the nozzle, and returning to the step 1).
In the step 2):
when the difference between the pressure values of the pressure sensors on the two sides is constant to zero, the jet axis track is superposed with the x axis, and the judgment is that the jet axis track meets the requirement;
when the pressure values of the pressure sensors on the two sides are not zero and the pressure difference is constant to be a non-zero value, the axial track of the jet flow is parallel to the x axis, and the distance is a certain value, so that the requirement is met;
when the difference between the pressure values of the pressure sensors on the two sides changes irregularly, the track of the jet axis is not parallel to the x axis, and the judgment is that the requirement is not met.
And the x axis is a perpendicular bisector of a connecting line of the circle centers of the upper pressure detection hole and the lower pressure detection hole.
The circle centers of the upper pressure detection hole and the lower pressure detection hole are both positioned in an annular region formed by a turbulent flow region in an initial jet flow state and a constant speed core region in the initial jet flow state.
Compared with the prior art, the invention has the following advantages:
1. the invention adopts the pressure difference sensor to record the pressure difference of the two pressure detection holes, and the measurement process is more convenient.
2. The method can judge the jet axis track of the three-way jet servo valve according to the detected pressure difference, and is more intuitive and more reliable compared with the traditional judging method based on experience, intuition, hand feeling and the like.
3. The jet receiver is provided with the jet receiving hole in the center, so that the problems that the receiving flow is limited and the sensitivity is not high due to more position limitations when two pressure detection holes are formed are effectively avoided, and the three-way servo valve can be more freely provided with the positions of the two pressure detection holes due to the fact that only one jet receiving hole is arranged, and the detection sensitivity is higher.
4. The detection method is simple and has high efficiency.
Drawings
Fig. 1 is a schematic structural diagram of a jet pipe type electro-hydraulic servo pressure reducing valve according to an embodiment of the invention.
FIG. 2 is a free nozzle jet flow field geometry diagram of an embodiment of the present invention.
Fig. 3 is a schematic plan view of a receiver according to an embodiment of the present invention.
Fig. 4 is a three-dimensional schematic diagram of a receiver according to an embodiment of the invention.
FIG. 5 is four different cases of fluidic axis trajectories in an embodiment of the present invention.
Fig. 6 is pressure variation trends corresponding to the pressure detecting holes under four different conditions in the embodiment of the present invention, where fig. 6a is the pressure variation trend corresponding to the pressure detecting hole under a condition a, fig. 6b is the pressure variation trend corresponding to the pressure detecting hole under b, fig. 6c is the pressure variation trend corresponding to the pressure detecting hole under c, and fig. 6d is the pressure variation trend corresponding to the pressure detecting hole under d.
Fig. 7 is a diagram of pressure difference changes corresponding to the upper and lower pressure detecting holes under four different conditions in the embodiment of the present invention, where fig. 7a is a diagram of pressure difference changes corresponding to the upper and lower pressure detecting holes under a condition, fig. 7b is a diagram of pressure difference changes corresponding to the upper and lower pressure detecting holes under b condition, fig. 7c is a diagram of pressure difference changes corresponding to the upper and lower pressure detecting holes under c condition, and fig. 7d is a diagram of pressure difference changes corresponding to the upper and lower pressure detecting holes under d condition.
The notation in the figure is:
1. the device comprises a valve body, a valve core, a valve body, a valve core, a spring, a pressure difference sensor, a pressure1Center of section circle of constant-speed core area in initial jet state, P1Center of cross-section circle of upper pressure detecting hole, P2The center of the circle of the section circle of the lower pressure detection hole, delta and the opening degree of the valve port.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Examples
As shown in figure 1, the jet pipe type electro-hydraulic servo pressure reducing valve of the invention consists of a valve body 1, a valve core 2, a spring 3, a torque motor 13, a flexible oil supply pipe 14, a jet nozzle 15 and a jet receiver 16, wherein a jet receiving hole 7 on the jet receiver 16 is connected with a right cavity of the valve core, when the input control current of the jet pipe type servo pressure reducing valve is zero, the torque motor 13 does not act, as shown in figure 3, the turbulent flow area of the jet flow projected on the jet receiver 13 is a section circle 9, and the constant-speed core area is a section circle10, the center of the circle is O1And the section circle 9 of the turbulent flow region is tangent to the excircle of the jet flow receiving hole 7, the energy received by the receiving hole 7 is zero, and the valve core is positioned at the right side under the action of a left side spring. After the control current is applied, the jet nozzle 15 is driven by the torque motor 13 to deflect leftwards, the jet energy received by the receiving hole 7 on the jet receiver 16 is gradually increased, and the pressure generated at the right end of the valve core is gradually increased. Because the left end of the valve core is acted by the spring, when the pressure in the receiving hole is larger than the elastic force of the spring, the valve core 2 moves towards the left end, the opening degree delta of the valve port is increased, part of pressure oil entering from the oil supply port P is communicated with the control oil port C through the opened valve port and finally enters the left side of the valve core 2, the feedback effect is achieved, and the problem that the instantaneous displacement of the valve core 2 is overlarge is solved. When the pressures at the two ends of the valve core 2 are equal to form new force balance, the valve core is stabilized at a certain working position. At this time, the offset amount of main spool 2 is proportional to the control current. The jet pipe 15 can move to the position right above the jet receiving hole 7 furthest, the jet stream turbulent flow region projected on the jet receiver 16 is a section circle 12, the constant-speed core region is a section circle 11, the circle center of the jet stream turbulent flow region section circle 12 coincides with the circle center of the jet receiving hole 7 at the moment, namely the coordinate origin O, the point is the terminal point of the jet axis trajectory, and the energy received by the jet pipe receiving hole 7 reaches the maximum value at the moment.
As shown in FIG. 2, the jet oil is injected into the stationary homogeneous fluid through the jet nozzle 15, and the jet is not considered to be affected by the impact surface before the jet contacts the surface of the receiving hole, so that it is equivalent to injecting a stationary fluid in an infinite space, and is a free-submerged turbulent jet whose flow is shown by a broken line in the figure, and includes a constant velocity core region and a turbulent region, wherein the velocity of the jet in the constant velocity core region is v0The jet velocity in the turbulent zone is v. in this example, the diameters D of the jet nozzle 15 and the receiving bore 7 are both 2R, the distance of the outlet of the nozzle 15 from the plane of the receiver 16 is typically L ≈ (1-1.4) D. according to the precise numerical description of the pressure distribution proposed by zalmann and Semikova in the injection category of incompressible turbulences, when the jet injection angle α is 14 °, the angle γ of the core zone is 11 ° 26', the length of the constant velocity core zone is 5D. in this example, the distance L of the jet nozzle 15 from the plane of the jet receiver is 1.2D, the geometric relationship in the graph is as follows:
constant velocity core area stream diameter
Shear layer stream diameter
As shown in fig. 3, the two pressure detection holes 8 and 8 'on the jet receiver are respectively located on two sides of the jet receiving hole, the center of the jet receiving hole 7 is located on the perpendicular bisector of the central connecting line P1P2 of the two pressure detection holes 8 and 8', and R is the radius of the jet receiving hole and is the radius of the pressure detection hole. During installation, the position of the jet nozzle 15 is adjusted back and forth in the perpendicular direction of the P1P2 according to requirements, so that the pressure difference and the change of the pressure difference at the detection small holes 8 and 8' are in accordance with expectations. When the jet axis is required to coincide with the x axis, the pressure difference detected at the upper and lower detection holes 8 and 8' is constantly zero; when the jet axis is required to be parallel to the x axis and is separated from the x axis by a certain value, the pressure difference value at the upper and lower detection small holes 8 and 8' is a non-zero fixed value in a certain interval. When the pressure difference value at the two detection small holes is detected to be changed irregularly, the trajectory of the jet axis is not parallel to the x axis, and the position of the jet nozzle 15 needs to be adjusted continuously if the trajectory of the jet axis is generally determined to be not satisfactory. The upper and lower detection small holes 8 and 8' are symmetrically arranged at two sides of the jet receiving hole 7, and the coordinates of the upper detection small hole 8 in the drawing are (x, y), so that the detection small holes can receive the energy of the jet pipe to the maximum extent in the swinging process of the jet pipe, and are arranged at the positions close to the initial jet and at the constant-speed core area as far as possible. Then derived from the graphical geometry
The detection small hole is arranged near the initial jet flow position, so that the identification degree of the receiving pressure of the detection hole is ensured, certain detection pressure still exists when the jet flow pipe moves to the end position, and the two detection holes 8 and 8' do not interfere with the jet flow receiving hole 7, so that the detection small hole has the following geometrical relationship according to the diagram:
meanwhile, in order to ensure that the output pressure of the small detection hole 8 can be improved as much as possible when the position is fixed, the detection holes 8 and 8' should receive the jet beams of the constant-velocity core region and the shear layer as much as possible, so that the detection holes should be located in the region between the circle 9 and the circle 10 as much as possible, and the radius ranges of the detection holes can be obtained according to the geometrical relationship shown in the figure:
taking the radius R' of the detection pore as 0.5R. According to the prior art, the entity distance between two adjacent processing holes can be guaranteed to reach millimeter-scale precision, the entity distance between the lower edge of the detection small hole 8 and the upper edge of the detection small hole 8 'is 0.02mm in the example, namely the distance between the lower edge of the detection small hole 8 and the upper edge of the detection small hole 8' and the x-axis is 0.01 mm. The y coordinate value of the detection small hole 9 is determined, and the y is 0.5R + 0.01. According to the above known conditions, the inequality (2) can be:
the restrictions of inequalities (1), (2) and (3) are taken into consideration, in this example
The coordinates of the two detection small holes 8 and 8' are (1.6R,0.5R +0.01), (1.6R, -0.5R-0.01) respectively. The two detection apertures 8, 8' are symmetrical about the x-axis.
As shown in fig. 4, the two pressure detecting holes 8 and 8 'on the jet receiver 16 are symmetrically distributed about the jet receiving hole 7 and arranged in a splayed shape in space, and in order to avoid interference with the jet receiving hole 7 and the receiving long hole 17, the included angle between the axis of the two pressure detecting holes 8 and 8' and the axis of the jet receiving hole 7 ranges from 15 ° to 35 °, and in this example, the included angle is preferably 30 °. The center distance between the two detection small holes is R +0.02(mm), the radius of the detection hole is R' which is 0.5R, and the radius of the jet receiving hole is R. The jet receiver 16 is in the shape of an inverted boss, the tail part of the jet receiver is provided with two symmetrical longitudinal sections, and the two pressure detection holes are connected with the pressure difference sensor through the two detection long holes connected with the two pressure detection holes. And recording the pressure difference of the two detection holes 8 and 8' in the process of driving the torque motor by electrifying current so as to drive the nozzle to move. When the pressure difference is constant to be zero, the jet axis track is coincident with the x axis; when the pressure difference value is constant to be a non-zero value in a section of interval, the jet flow axis track is parallel to the x axis, and the distance is a constant value; when the pressure difference value changes irregularly, it is stated that the jet axis is not parallel to the x-axis, and generally this situation is judged to be unsatisfactory, and the position of the jet nozzle 15 needs to be finely adjusted to be on a plane perpendicular to the y-axis and passing through the x-axis as much as possible, so that the ideal situation of the jet axis trajectory is ensured.
As shown in fig. 5, a, b, c, d respectively correspond to four typical jet trajectory situations during the movement of the jet nozzle 15 driven by the torque motor. Wherein a is the condition that the jet axis trajectory coincides with the x-axis, b is the condition that the jet axis trajectory is parallel to the x-axis and has a certain distance, and c and d are the conditions that two different jet axis trajectories are not parallel to the x-axis. Of these four different jet axis trajectories, a and b are satisfactory jet axis trajectories, and c and d are unsatisfactory jet axis trajectories.
Fig. 6 shows the pressure variation trend corresponding to the pressure detecting holes under four different conditions, a, b, c, d, in the embodiment of the present invention. As described above, a is a case where the jet axis trajectory coincides with the x-axis, and in this case, the pressure detection holes 8 and 8' have completely identical pressure variation tendencies. b is parallel to the x axis and is at a certain distance, and the pressure values of the two detection holes have similar variation trends under the condition that the pressure values are not zero. In both cases c and d, the pressure values measured by the two detection pressure holes 8 and 8' change irregularly.
FIG. 7 shows the variation of the pressure difference between the pressure detecting holes 8 and 8' in four different cases a, b, c, d according to the embodiment of the present invention. As described above, a is a case where the jet axis trajectory coincides with the x-axis, and in this case, the pressure difference value detected at the two pressure detection holes is constantly zero. b is parallel to the x axis and is at a certain distance, and the difference value is a certain value under the condition that the pressure values of the two detection holes are not zero. In both cases c and d, the pressure difference between the two pressure detection holes varies irregularly.
The embodiments described above are intended to facilitate one of ordinary skill in the art in understanding and using the present invention. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the embodiments described herein, and those skilled in the art should make improvements and modifications to the present invention based on the disclosure of the present invention within the protection scope of the present invention.
Claims (1)
1. A three-way jet pipe servo valve jet axis track debugging device is characterized by comprising a valve body (1), a jet receiver (16) arranged on a jet area on the valve body (1), a jet nozzle (15) which is just opposite to the jet area and controls displacement through a torque motor (13), and a pressure sensor connected with the jet nozzle (15) through a detection hole, wherein the jet receiver (16) is in an inverted circular truncated cone shape, the lower part of the jet receiver is fixed in the jet area, the upper part of the jet receiver is opposite to the jet nozzle (15), the upper end surface of the jet receiver is respectively provided with a jet receiving hole (7), an upper pressure detection hole (8) and a lower pressure detection hole (8 '), the jet receiving hole (7) is communicated with a receiving long hole (17) arranged in the valve body, the upper pressure detection hole (8) and the lower pressure detection hole (8 ') are respectively connected with a pressure difference sensor (4) through a right detection long hole (5) and a left detection long hole (5 '), the jet flow receiving hole (7) is a straight hole perpendicular to the upper end face of the jet flow receiver (16), the upper pressure detection hole (8) and the lower pressure detection hole (8 ') are inclined holes and are arranged symmetrically in a splayed manner, an included angle between the axis of the jet flow receiving hole (7) and the axis of the upper pressure detection hole (8) and the axis of the lower pressure detection hole (8') is 15-35 degrees, a perpendicular bisector of a line connecting the circle centers of the upper pressure detection hole (8) and the lower pressure detection hole (8 ') passes through the circle center of the jet flow receiving hole (7), the radius R' of the upper pressure detection hole (8) and the radius R 'of the lower pressure detection hole (8') are half of the radius R of the jet flow receiving hole (7), and the distance between the circle centers of the upper pressure detection hole (8) and the lower pressure detection hole (8 ') is R' +0.02 mm;
the debugging method of the three-way jet pipe servo valve jet axis track debugging device comprises the following steps:
1) connecting pressure difference sensors on two sides of the valve body, placing the jet nozzle at an initial position, starting a driving torque motor, and enabling the jet nozzle to finish a moving process from the initial position to a final point under the action of the torque motor;
2) in the moving process of the jet flow nozzle, the pressure difference value of the pressure detection holes on the two sides is obtained, and whether the track of the jet flow axis meets the requirement or not is judged according to the pressure difference, and the method specifically comprises the following steps:
when the difference between the pressure values of the pressure sensors on the two sides is constant to zero, the jet axis track is superposed with the x axis, and the judgment is that the jet axis track meets the requirement;
when the pressure values of the pressure sensors on the two sides are not zero and the pressure difference is constant to be a non-zero value, the axial track of the jet flow is parallel to the x axis, and the distance is a certain value, so that the requirement is met;
when the difference between the pressure values of the pressure sensors on the two sides changes irregularly, the trajectory of the jet axis is not parallel to the x axis, and the jet axis is judged to be not in accordance with the requirement;
the x axis is a perpendicular bisector of a connecting line of circle centers of the upper pressure detection hole and the lower pressure detection hole, and the circle centers of the upper pressure detection hole and the lower pressure detection hole are both positioned in an annular region formed by a turbulent flow region in an initial jet flow state and a constant speed core region in the initial jet flow state;
3) when the jet flow axis track meets the requirement, namely the jet flow axis track is overlapped with or parallel to the x axis and has a set expected value at a distance, the pressure difference value sensor is disassembled, the detection long hole is sealed by using a sealing screw, and the debugging of the jet flow axis track is completed;
4) and when the jet axis trajectory does not meet the requirement, readjusting the installation position of the nozzle, and returning to the step 1).
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| CN201810123205.7A CN108506257B (en) | 2018-02-07 | 2018-02-07 | Three-way jet pipe servo valve jet axis track debugging device and method |
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| EP3208473B1 (en) * | 2016-02-19 | 2019-04-03 | Hamilton Sundstrand Corporation | Jet pipe arrangement for a servo valve |
| CN106194898B (en) * | 2016-07-08 | 2018-02-09 | 同济大学 | A kind of jet pipe servo valve nozzle and the receiver hole centering method of inspection |
| CN206268174U (en) * | 2016-10-31 | 2017-06-20 | 北京实验工厂 | A kind of local derviation jet servo valve prestage performance testing device |
| CN107131167B (en) * | 2017-03-23 | 2018-07-03 | 同济大学 | A kind of jet pipe servo valve and adjustment method of adjustable nozzle-axis position |
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